﻿////////////////////////////////////////////////////////////////////////////
//
// Copyright 2022 Realm Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License")
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
////////////////////////////////////////////////////////////////////////////

using System;
using System.Runtime.InteropServices;

namespace Realms
{
    internal abstract class StandaloneHandle : SafeHandle
    {
        public override bool IsInvalid => handle == IntPtr.Zero;

        public StandaloneHandle(IntPtr handle) : base(IntPtr.Zero, true)
        {
            SetHandle(handle);
        }

        protected override bool ReleaseHandle()
        {
            if (IsInvalid)
            {
                return true;
            }

            try
            {
                Unbind();

                return true;
            }
            catch
            {
                // it would be really bad if we got an exception in here. We must not pass it on, but have to return false
                return false;
            }
        }

        protected abstract void Unbind();
    }
}
